艾滋病病毒侵入人体后通过什么途径摧毁免疫系统？ 当艾滋病病毒通过性接触传播时, 病毒必须穿过组织屏障进入人体。
What route does HIV take after it enters the body to destroy the immune system？
介绍了雷电等过电压侵入计算机（或电子设备）系统的途径，研究了如何防止由线路和地线进入的过电压。
The intrusion way of over-voltage like lightning into computer (electronic system) was intro- duced, and the protection methods against over-volt- age from circuits and ground were studied.
应用推荐